[PATCH] net: dsa: fix led_classdev build errors

[Randy Dunlap]

Fix build errors when LEDS_CLASS=m and NET_DSA_HIRSCHMANN_HELLCREEK=y.
This limits the latter to =m when LEDS_CLASS=m.

microblaze-linux-ld: drivers/net/dsa/hirschmann/hellcreek_ptp.o: in function `hellcreek_ptp_setup':
(.text+0xf80): undefined reference to `led_classdev_register_ext'
microblaze-linux-ld: (.text+0xf94): undefined reference to `led_classdev_register_ext'
microblaze-linux-ld: drivers/net/dsa/hirschmann/hellcreek_ptp.o: in function `hellcreek_ptp_free':
(.text+0x1018): undefined reference to `led_classdev_unregister'
microblaze-linux-ld: (.text+0x1024): undefined reference to `led_classdev_unregister'

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: lore.kernel.org/r/202101060655.iUvMJqS2-lkp@xxxxxxxxx
Cc: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
---
 drivers/net/dsa/hirschmann/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- lnx-511-rc2.orig/drivers/net/dsa/hirschmann/Kconfig
+++ lnx-511-rc2/drivers/net/dsa/hirschmann/Kconfig
@@ -4,6 +4,7 @@ config NET_DSA_HIRSCHMANN_HELLCREEK
 	depends on HAS_IOMEM
 	depends on NET_DSA
 	depends on PTP_1588_CLOCK
+	depends on LEDS_CLASS
 	select NET_DSA_TAG_HELLCREEK
 	help
 	  This driver adds support for Hirschmann Hellcreek TSN switches.